Article R2162-15 of the French Public procurement code
The purchaser shall publish a design contest notice under the conditions set out in articles R. 2131-12, R. 2131-13 and R. 2131-16 to R. 2131-20. If the purchaser intends to award a service contract to the winner or one of the winners of the design contest in application of article R. 2122-6, it must indicate this in the contest notice.